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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99f38d588f858a440b333e999deb1ef1d76cfa3881345cbff7bfec7ea0fc47e' 
  AND token = 'DWkw5X31U3BKXK4RWXI4k7P51PLr7u3Eu66jgAv9PmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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