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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b50609a5fb69732d74b229e8bb02ac5083026f7c3fe1c34e77156da93156572' 
  AND token = 'gO/NpsouU/FNudN85epA7eheV1TzjDhPZt3CDXYfaek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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