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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63f87457f4e4230736954e5e315ae1374f3a07c3a08558db109322b2fb64052' 
  AND token = 'dQs/qSvlzOPAFu2TSoAUwB0MX7laqu7AwuZUQ6ZcpY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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