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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6f22176f540048eb7b62d65d69150413cb17b4b3edc2ee7b5318a3101e2f01' 
  AND token = 'cgo5VlcSmWBTDX7ww9U6a82MzYMzyNPDP7gb4HKjdqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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