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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd6ea4e3579bcd05b22a3f51574c4690a3e2a64080bb2d71e4b7f8ed9ea3cd6' 
  AND token = 'ua+uLY733HlJWcSHSGuuTXfCt3p5n76+tULO/dF8DvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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