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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e16889b250f9974b4c238776d422d28fda85056f9092a38e42a297ed083c2c1' 
  AND token = '2tiZiFoQE/W20ZAGwis8FCDS/glNJvpcXjElScIHQUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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