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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ccf22746743af1ed5d1c33a64790977ac1f0370f0873e89682ced08398056d' 
  AND token = '89Fi/O1NXMSnpynbcuG6Fm8STthCGYXBdw9SbNPOQyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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