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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd34c779ed0eae9b318cef211c134ab50149ea85a864b2e53090e8ef8da3873a' 
  AND token = 'dlDwcEXdzm67/2azV5vzbSfA9GZT2iSy6KiZ2ULvXxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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