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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3feb933ae3dc81b849dea0e29877f7974ed3af68263d9a8abfa918c6b3aeca4' 
  AND token = 'JSEwQqLppm9V8JfaEWgvLVu579UTXUzr4DSW8I3tiUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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