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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4e4cffee28073c6e9ed0914e39fff209f3ee37cce9d2764695b4754d8dacbd' 
  AND token = 'F1dw7hkouRdkmu2pS2/i2iXsQGreQkIxSBOJKShPuNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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