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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48fd9773e933ade8d27fae96a19297b09361c626b95315d3a16764082a5db84e' 
  AND token = 'p85I3Oa1UYP4P3A04mtZgKBmtaJ3ccunHoIPbr3gVZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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