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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3cc6a63c247b67f2a3fb05fd690ab64bceda54b5e6f964c17fea0720937fa9' 
  AND token = 'iJRBmLRD+hfN01nvwHZ1mYhs1DvkBDFO9s7qpE4jJp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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