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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82f8948c5d6e79f76369b22dc798a092cddf5bdfe105bda2632fe544a55b120' 
  AND token = '7Zku/E/afTwPlRiTeIXPtKX4lDMnfT2qO9hN2CQCoRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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