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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d57a6b67a07d0d5376323902944f0798ad766edce8fc01ad0f481c686f3e3a0' 
  AND token = 'ZldszxTdBH0wIFAOt3YlbddnGawU1te+CRZ5VOWS/h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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