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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbbc8bc9cf7fd50da329129eccb542b26698d8dcec764e1885b0d2fc6db4108' 
  AND token = '7/0JYWEghmqrD98MCZEKdZrThCY3bM8GJkIy10Kee/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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