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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b52abd67114a66bf25606fb1d6e356e185428b912dea5c4202fcc12588f92ff' 
  AND token = 'Q/QPTs+rxGTYDh1O5TC1Cns1/H6W0Rc1dtCTbmp8+nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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