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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68db9337b28ab899833e93e143cb285f87a49146a7398eb8220e24dc735a433' 
  AND token = 'EOBtKT2phRovb8iEVqI1VbrBpXGenE7Bb+kWMOc0eEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}