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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e47d07ba11ba4a11459612b55dc091e89d933c3d81cfd3240a522474d8a4808' 
  AND token = 'fDm6695veP9SMKzgbcFVsrUjvwEHx4/slwHs08rVeOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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