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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267f2b10d6de318f23223552b53adc958b54192df302ef336d10152abfe64153' 
  AND token = '37Fr12nk08mOmu/iFofyQKwhVKdY9N08x08AGBzQvOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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