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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1770758d6d2c0d39d2945f9867fcce4726f4a4165fe2aa1ab2c2d62a2a0ef5cd' 
  AND token = 'dLB/TDIkYmcZsAkD4BHu7cIATbYwIDmrEvzE2x7HNr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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