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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe8cca5de74fbafab3eb896d07f3f6ecba8f223e1205352880fb756e96ccbda' 
  AND token = 'whF6sEbqjWOdjf3DhqPKGpNJeC5rmXOOD3oJIUtP3yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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