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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c2988e7bb067fce2cca5621f77a6b2a7a62ff56f6055f3eb9e04124f85d7b2' 
  AND token = 'aN0BZTTW0r32oSvWGRXdAVfvx6cj42HFgMI+sG4m9To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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