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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9a1c4707b74eb8f68bc1b14eca8139044ef6117138667bd8aa90cc2b1a769b' 
  AND token = '0zWomtR5utqsvDm5Izd6YDeQWNI4i4KrfzLCSkvtezY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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