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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd083436ac543804de595140e8dc3ff62e606df8dc808aa79625e2e0e013c8e' 
  AND token = 'yq4kh6dI3d6Vo0mQSPPUqv3/SDiyCBYNS7q1dgK+gxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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