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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84fc7ab946fa99c8d10fca6aba0242888ac658ba11b64e867e72267f0522355' 
  AND token = 'jBJhzXLLmlTmhL3tFfPJjRDNc6DIfNF8Ggr9jOll+1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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