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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fd6440761a0c439687cdcbe3053443e5771db286999827cb49c1bf93271fe7' 
  AND token = 'iSdeqvKIqA6xI2/qOgb1C4pOgjPVnS6L9cEy/216MK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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