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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d9c2033ab667bb8dc221f9b5c22d4bdd622778f2a847f72379510b843115c3' 
  AND token = 'OXNtTtFUuJVuUhwf7s1a+lNfl1MFXvK6XmsILPCotMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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