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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32a4f067e2389bf0f3f0cf646924d314c9e97c969e1d3089df386764d0248d3' 
  AND token = 'VD1gzcWC6rUNg+Q0vRQQUDdjNuS71ByzERGS4DTCEd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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