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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0cfc1359948755f68ec9590daa0d165791ddc2aa20d81bfb014168b5ea7a68' 
  AND token = 'rjIQaxOPFHs21vB1ulMe5rIDNtwbxf5SQ8pvTIc8xeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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