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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05b0d68558401f0e4f7af0484a2014f79d55a96fd4622eb9cc1c4bcbce3b095' 
  AND token = 'zulnDcmHaaPLarU63QLjm8LaQHPCL+XqkxusvoBpjNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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