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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce307c2f4c2563a1a5e037d134ca925df40a49e3152f10c7cecfb61b3640d03' 
  AND token = 'A3R8kb5DfOc4JOqQelYRwHZ6J6YzUCix9k4KoJyj+t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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