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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5f7174ce7eb1545fa523a6d4fbf707e642f4764e3858d4bd1d155e6c7acba2' 
  AND token = 'hYOueH/DbnJ3ETvYrDuF8+QMMBlA8zT9zQ26dr068Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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