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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d304b247ca1492d193ab5db5e97e9e6ac730db494dbe60ba586de4e082d389e' 
  AND token = 'vJvHuGN5ybctAhgz+lU1BpFOpzKUp7mMwNEEWt2tZ/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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