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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb571da91daa7e5f76f9a8884e36dc7349d2aa788a14bd5e662ce0a5bcbc1625' 
  AND token = 'Vn0Jtp3O12nLWIfZbMznA1DrDXuqLyMY4qdRdWKOtzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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