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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54836f879b89e9f3aeca58b09a91ea5f14fac1f21b45c3d0b21c0d4c480f0fbd' 
  AND token = 'ZJW7XqrzhwlidFO8aW9hABTZgykfKgChQB1UfiZx01Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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