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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f40d2b425deee24d8c2c32603a9a704bf7fca2948173db84aee084eb8d8f3e' 
  AND token = 'y+67E0zgUlmEMRf4NrAXaSdEZFuwNwLIj0mPFZ2snx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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