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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7093d52667952fb06391cc62e5324e550b3d76a84f290265aa693d166af139d' 
  AND token = '01Q4B1yzdAh+uKCKaPE8AWCGCtntn7WsPcCUNQYGvL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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