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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec90fcbcffbdb8a1d91eb2b4570194e389ff08e91fab10dc44b1e699e7359a14' 
  AND token = '5lvLRoPQkg5bGWgRfPmESX0hQp5DzCTnqxnV4oqh0+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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