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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f61ab42bbe00b8880e7db62875ad3b093458189630d0c859d5acea7d1c22ef7' 
  AND token = 'KBi/GlobR1dFGlRKQ4sXQJ8cHKjlK9kOpNbVTHz/aXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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