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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decc0778e7a2b6aa48a0e405f17c00eecfdc928455f8afa4eb617bfb6702fb48' 
  AND token = 'CFI0GoKevkLjUbYG1oW0pTByp3ol9XXdh0XQXOIi1bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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