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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da42ce7f821d38b2325dc891c79f6e36af7847f1a1d135257d6dd8fe559e35ab' 
  AND token = 'HU5542SxLo0LHj6ZMS17BDmidBynWtuQ9OEem++Pe9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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