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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec4889c788c99abc8fbb0f7d34afe7712caaeda690d4177ec24058a2e602fc0' 
  AND token = 'AWFi3s0XzkZvGmVAjR05FYrltp6c1D1EcX2G4f1zZmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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