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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de02554e236db26aba3e2c2a993cdd31a4052db972de65edf24b61e5dcecb7a' 
  AND token = 'pkgn/TqzwkautVflGXD27NixiUq6uuuxzHmvGPfFnic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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