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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073b391eef13fcb88488b62787230be8610c351eb31ffab280592473d82fbd3a' 
  AND token = 'zrpJniw2XR/aca1ZBjQZrKs5M1sktSmEGavcFiF8z3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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