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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1132d48bb04cd5fdb0a3eed2c3697276f9cc1e146db38f8c5fb85585a71c0c55' 
  AND token = 'EgcZp0rKfyWnrGCwWpFA5BFPqBXAH32Vr9K7KFtEhto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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