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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2989cb9bf310adeceaf9353a078c0582b9d1d00cd909221e7dca3d6898728b6' 
  AND token = 'CRNcq1q2l8oywz0n/GtdU6WezMVxpIz/NRfIU/vOO8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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