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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeddb895820901bc4817c5439267ec8697e0eb094b733ee81a4b527dbc584909' 
  AND token = 'AGN+AdLI4e5W2Dn8Mzrm8t65ki+BIEOswiro/O5huvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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