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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a287b5e069064fe4c2d6e156a0ca2f458a82f100ba47037eb8695917bcfe5a' 
  AND token = 'U1+8r2k/8R0h/cQvm9K7D9QoFAM8ZNruwgN8Utl/q30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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