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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d97abbfd9ca1c4695cad3d836f164d0a3b9cabb856ee8b5d5bfc8b114d709d' 
  AND token = 'kGH1lJjMcDcFGboDMUHH7CkcnCWhLMuBe5qjfZHHTYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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