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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e184afe379e952763bc5a375466b5672e8417ed7aed579b93a63c2dd07ae763' 
  AND token = 'JaWlv+HigNk5YiUsxd1I3fe/fhE6DkPZAk0+p9d70VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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