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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b039bcac65a7e1e98039bf59d8c368bb9007546567c81c5a791659a9ef685c4f' 
  AND token = '7TkVaZvsH3gf7Jb/2Pj35nhWozxlMoUOb1xOocBxR1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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