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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95ba591ecb4b8eead5855816845fd12c09d5442a3d14bd55ef179aefe1ee8e7' 
  AND token = 'd7UNhL+mgiNZnSCgbYQ/m7r/CCdb1kWvi4CiMZN1BBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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