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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be0bac4ceb5d38cd628a17560fdbffb420d4e9b560fa46bc9629b4e03e0676e' 
  AND token = 'lTzWdDenwuoN/fpP360cD6faTnacYtHAlHo61rlw/x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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