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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98fa7e66ac53ac39537278cb00331a5bae08ae7bc66fc5a71c25cf86ae91b29' 
  AND token = 'no+E4Bhzg/HOUL85ct/dA3uzzNaB4ZSoMHW2uPlHB7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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