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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61b5b189327ac515d3a100878c9db8d64c432b758c2601a47c328b957b3bf1d' 
  AND token = 'eM611kvk1RxHW6hghlWrOG5WwoI/8ECOdbGK+fGTNz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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