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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337517fedf06c13c154da67f4a0176070f9c062f1fa191158c575ab51aa9db9c' 
  AND token = '57is+JVy6ZxUurPD+VCf5H8oVhyNpUIxgcYRib+yACM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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